1 files changed, 4 insertions, 0 deletions
diff --git a/XY.cpp b/XY.cpp
index e2aa075..eaebe1f 100644
--- a/XY.cpp
+++ b/XY.cpp
@@ -43,3 +43,7 @@ bool XY::operator != (const XY& rhs) const {
 	return !(*this == rhs);
 }
 
+size_t std::hash<XY>::operator () (const XY & instance) const {
+	return instance.x | (instance.y << 16);
+}
+